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I would like to hear some opinions on how long an electric blower motor, with grease fittings, will last when it has never been greased since it was purchased and put in service, regardless of the horsepower rating. A motor that runs 24 hours a day. How many years of service will occur before the motors begin to fail?

Unless you are 100% certain about the amount of grease to use, the type if grease to use, and the proper procedure for applying the grease to those fittings, do NOT connect a grease gun to those fittings!

I don't know about other applications but my pool pump/motor seems to last about 1 year. I've had it replaced twice in the last 24-30 months due to no grease. I have (had) a pool service take care of it before and they always said they greased it on a monthly basis but the armature shop said there wasn't a lick of grease to be found.

Greasing motor bearings can be a dammed if you do or dammed if you do not. I do not like greasing motors. I have seen motors that were 20 years plus with out grease being added with a problem. And I seen motors in a new building go out before the first PM. I have never greased a motor witthout thinking about the motors that I had to clean out.
So for how long a motor will last the answer is yes.